I have a Radeon Hd 4870x2 Gpu. After updating from Windows 8 to Windows 8.1 my Photoshop CC detect an error on gpu drivers and it do not work perfectly. Also, it's impossible use Catalyst Control Center (if I launch it wrote: "Catalyst control center cannot be started. There are currently no settings that can be configured using Catalyst contol center".

I tried to re-install the gpu's drivers but all remain the same. For me it's very important work with Photoshop. Do you have a solution?

You could do a refresh for Windows 8.1 which will put you back on Windows 8. There you continue to do your Photoshop stuff until either a driver for 4000 series card for 8.1 appears (don't hold your breath). The other would be that you get a card that supports WDDM 1.3 and above.